Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 21: Superconductivity: Poster Session

TT 21.33: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Ordinary and Triplet Superconducting Spin Valve Effect in Fe/Pb based systems — •Pavel Leksin1, Nadir Garifyanov2, Ilgiz Garifullin2, Yakov Fominov3, Joachim Schumann1, Yulia Krupskaya1, Vladislav Kataev1, Christian Hess1, Oliver Schmidt1, and Bernd Büchner11Leibniz Institute for Solid State and Materials Research IFW Dresden, Germany — 2Zavoisky Physical-Technical Institute of RAS, Kazan, Russia — 3L. D. Landau Institute for Theoretical Physics of RAS, Moscow, Russia

We report on experimental evidence for the occurrence of the long range triplet correlations (LRTC) of the superconducting (SC) condensate in the spin-valve heterostructures CoOx/Fe1/Cu/Fe2/Pb [1]. The LRTC generation in this layer sequence is accompanied by a Tc suppression near the orthogonal mutual orientation of the Fe1 and Fe2 layers’ magnetization. This Tc drop reaches its maximum of 60mK at the Fe2 layer thickness dFe2 = 0.6 nm and falls down when dFe2 is increased. The modification of the Fe/Pb interface by using a thin Cu layer between Fe and Pb layers reduces the SC transition width without preventing the interaction between Pb and Fe2 layers. The dependence of the SSVE magnitude on Fe1 layer thickness dFe1 reveals maximum of the effect when dFe1 and dFe2 are equal and the dFe2 value is minimal [2]. Using the optimal dFe1, dFe2 and the intermediate Cu layer we realized almost full switching from normal to SC state due to SSVE.

[1] P. V. Leksin et al, Phys. Rev. Lett. 109, 057005 (2012).

[2] P. V. Leksin et al., JETP Lett., vol. 97, iss. 8 (2013).

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